EP2425158B1 - Valve with bidirectional seal assembly - Google Patents
Valve with bidirectional seal assembly Download PDFInfo
- Publication number
- EP2425158B1 EP2425158B1 EP10722842.1A EP10722842A EP2425158B1 EP 2425158 B1 EP2425158 B1 EP 2425158B1 EP 10722842 A EP10722842 A EP 10722842A EP 2425158 B1 EP2425158 B1 EP 2425158B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- seal
- cage
- seals
- spacer ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002457 bidirectional effect Effects 0.000 title description 8
- 239000012530 fluid Substances 0.000 claims description 63
- 125000006850 spacer group Chemical group 0.000 claims description 52
- 239000007769 metal material Substances 0.000 claims description 4
- 239000012815 thermoplastic material Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 description 36
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 238000012369 In process control Methods 0.000 description 1
- 229920006362 TeflonĀ® Polymers 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000010965 in-process control Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/243—Packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86718—Dividing into parallel flow paths with recombining
- Y10T137/86734—With metering feature
Definitions
- This disclosure relates generally to valves and, more particularly, to a bidirectional seal assembly for use with valves.
- Valves are commonly used in process control systems to control the flow of process fluids.
- Sliding stem valves e.g., a gate valve, a globe valve, a diaphragm valve, a pinch valve, etc.
- a closure member e.g., a valve plug
- a valve stem operatively couples the closure member to an actuator that moves the closure member between an open position and a closed position to allow or restrict the flow of fluid between an inlet and an outlet of the valve.
- valves often employ a cage that interposes in the path of fluid between the inlet and the outlet of the valve.
- a cage can reduce capacity flow, attenuate noise, and/or reduce or eliminate cavitation.
- a cage surrounds the closure member to provide stability, balance, and alignment to the closure member.
- the closure member typically includes a channel or groove that receives a seal and/or piston ring that engages an inner surface of the cage.
- industrial process conditions such as pressure conditions and operational temperatures (e.g., temperatures between - 73Ā°C and 232Ā°C (-100Ā°F and 450Ā°F), temperatures greater than 232Ā°C (450Ā°F) with the use of an anti-extrusion ring, etc.) of the process fluids are used to determine the type of valve and valve components that may be used such as, for example, the types of seals that may be used to effect a seal between a cage and a closure member.
- a valve having a process fluid that experiences a relatively high pressure differential across its flow passageway typically employs a pressure-balanced closure member to minimize or reduce the thrust or force to be exerted by an actuator to move the closure member to a closed position.
- valves having larger sized ports or flow passageways e.g., greater than 2.54 cm (1 inch) in diameter
- a bidirectional seal assembly is often employed with pressure-balanced closure members to provide bidirectional sealing between the cage and closure member to minimize or eliminate leakage in forward and reverse fluid flow applications.
- Some known bidirectional sealing assemblies include spacer rings to maintain opposing seals separated or spaced apart from each other.
- the spacer rings are often sized to provide a clearance between the spacer ring (e.g., an outside diameter of the spacer ring) and a surface of the cage (e.g., an inner surface of the cage).
- the spacer ring may engage or contact the surface of the cage as the valve plug moves between an open position and a closed position, thereby increasing friction between the closure member or the seal assembly and the cage.
- spacer rings made of metal material can be used to prevent excessive or rapid wear of the spacer rings, such metal spacer rings may mare or damage the cage surface, thereby causing unwanted leakage and reducing the life of the cage.
- Patent Documents DE 802 488 C , US 4 706 970 A , US 2 187 257 A , WO 99/022164 A1 , US 2002/017327 , and US 2003/222410 A1 relate to various valve apparatus, and seals for use with a sealing apparatus.
- Patent Document EP 2 159 459 A1 forms prior art under Article 54(3) EPC. It relates to a sealing assembly for a shaft including a sealing component, at least one energizer associated with said seal component wherein said sealing assembly is configured for being disposed in one of a single gland, groove and space of a housing and being thereby configured for sealing in two axial directions in one of said single gland, groove, and space and is thereby configured for providing bi-directional sealing in a high-pressure seal operational area.
- An example seal assembly for use with valves described herein includes a first seal and a second seal opposite the first seal.
- the first and second seals are to sealingly engage a closure member of a valve and a sealing surface opposite the closure member.
- a spacer ring is disposed between the first and second seals to prevent the first and second seals from contacting each other. Additionally, the spacer ring is sized so that the spacer ring does not contact the closure member or the sealing surface.
- a valve in another example, includes a valve body having a valve plug disposed between an outlet and an inlet of the valve body.
- the valve plug moves between an open position to allow fluid flow through the valve and a closed position to prevent fluid flow through the valve.
- the valve also includes a cage having a first opening to slidably receive at least a portion of the valve plug and a second opening to control the flow characteristics of fluid through the control valve.
- a seal assembly is disposed adjacent an inner surface of the first opening of the cage and an outer surface of the valve plug to substantially prevent leakage of fluid between the cage and the valve plug when the valve plug is in the closed position.
- the seal assembly includes a first spring-loaded seal and a second spring-loaded seal opposite the first spring-loaded seal.
- the seal assembly also includes a spacer ring disposed between the first and second spring-loaded seals to maintain the first and second spring-loaded seals in spaced apart relation to prevent the first and second spring-loaded seals from contacting each other. Additionally, the spacer ring is sized to not contact the cage or the valve plug.
- a seal for use with a valve includes first means for sealing and second means for sealing opposite the first means for sealing.
- the first and second means for sealing are to sealingly engage a closure member of a valve and a sealing surface opposite the closure member.
- the valve further includes means for retaining the first means for sealing away from the second means for sealing to prevent the first and second means for sealing from contacting each other.
- the means for retaining is sized so that the means for retaining does not contact the closure member or the sealing surface.
- valves having a sliding stem such as, for example, control valves, throttling valves, etc., which may include a valve trim arrangement (e.g., a cage).
- valve trim arrangement e.g., a cage
- the example seal assemblies described herein effect a seal to substantially prevent leakage between a sealing surface or a cage and a closure member (e.g., a valve plug) of a valve.
- an example seal assembly described herein includes a first seal and a second seal opposite the first seal where both seals are disposed between an outer surface of the closure member and an inner surface of the cage.
- a spacer ring is disposed between the first and second seals to prevent the first and second seals from contacting each other when the pressure of the process fluid is insufficient to assist the seals to seal against a sealing surface (e.g., the inner surface of the cage and the outer surface of the closure member). More specifically, the spacer ring is at least partially disposed within cavities of the first and second seals and is sized (e.g., has a width or is dimensioned) to fit within outer surfaces of the first and second seals so that the spacer ring does not engage or contact the outer surface of the closure member and/or the inner surface of the cage.
- the spacer ring may be made of a thermoplastic material, a polymer, a metal, or any other material(s).
- FIG. 1 illustrates a cross-sectional view of a portion of a known valve 100.
- the valve 100 illustrated in FIG. 1 includes a valve body 102 that defines a fluid flow passageway 104 between an inlet 106 and an outlet 108.
- a valve plug 110 is slidably disposed within a cage 112 and moves between an open position and a closed position to control the fluid flow rate through the valve 100.
- a valve stem 114 couples the valve plug 110 to an actuator (not shown), which moves the valve plug 110 toward and away from a valve seat 116. In operation, the actuator moves the valve plug 110 away from the valve seat 116 to allow fluid flow through the valve 100 (e.g., the open position) and toward the valve seat 116 to restrict fluid flow through the valve 100.
- valve plug 110 sealingly engages the valve seat 116 to prevent fluid flow through the valve 100 (e.g., the closed position).
- a seal assembly 118 prevents fluid leakage between the valve plug 110 and the cage 112 when the valve 100 is in the closed position (i.e., when the valve plug 110 sealingly engages the valve seat 116) as shown in FIG. 1 .
- FIG. 2 depicts an enlarged portion of the valve plug 110, the cage 112, and the seal assembly 118 of FIG. 1 .
- the valve plug 110 includes a recessed portion 202 to receive the seal assembly 118.
- the seal assembly 118 engages an inner surface 204 of the cage 112 to prevent fluid from leaking between the cage 112 and the valve plug 110 when the valve 100 is in the closed position.
- the seal assembly 118 includes a first spring-loaded seal 206 disposed between a shoulder 208 of the valve plug 110 and a first spacer ring 210, and a second spring-loaded seal 212 disposed between the first spacer ring 210 and a second spacer ring 214.
- the seal assembly 118 also includes a retaining ring 216 to retain or hold the seal assembly 118 together.
- the first and second spring-loaded seals 206 and 212 include springs 218a and 218b disposed within respective outer jackets or coverings 220a and 220b.
- the springs 218a and 218b are typically helically-shaped springs.
- the spacer rings 210 and 214 prevent the first spring-loaded seal 206 from contacting the second spring-loaded seal 212 as the valve plug 110 moves relative to the cage 112. Additionally, the spacer rings 210 and 214 retain the spring-loaded seals 206 and 212 to prevent the spring-loaded seals 206 and 212 from becoming dislodged or trapped between the cage 112 and the valve plug 110, thereby preventing impairment of the operation of the seals 206 and 212, the cage 112, or the valve plug 110.
- the spacer rings 210 and 214 are made of a metallic material to prevent excessive wear to the rings 210 and 214 if, for example, the seals 206 and/or 212 wear such that the spacer rings 210 and/or 214 engage or contact the surface of the cage as the valve plug moves between an open position and a closed position. While spacer rings made of metallic materials can be used to prevent excessive or rapid wear of the spacer rings, such metal spacer rings may mare or damage the cage surface, thereby causing unwanted leakage and reducing the life of the cage.
- FIG. 3 illustrates a cross-sectional view of a valve 300 implemented with an example bidirectional seal assembly 302 described herein.
- the valve 300 illustrated in FIG. 3 includes a valve body 304 that defines a fluid flow passageway 306 between a first port or inlet 308 and a second port or outlet 310.
- the example seal assembly 302 provides a bidirectional seal, the direction of fluid flowing through the valve may be reversed such that the second port 310 is an inlet port and the first port 308 is an outlet port.
- a valve trim assembly 312 interposes in the fluid flow passageway 306 to control fluid flow between the inlet 308 and the outlet 310.
- the valve trim assembly 312 includes internal components of the valve 300 such as, for example, a cage 314, a closure member 316 (e.g., a valve plug), a valve seat 318 (e.g., a seat ring), and a valve stem 320.
- the cage 314 is disposed between the inlet 308 and the outlet 310 to provide certain fluid flow characteristics through the valve body 304 (e.g., reduce noise and/or cavitation generated by the flow of fluid through the valve 300).
- the cage 314 includes a bore 322 to receive (e.g., slidably receive) the closure member 316 and at least one opening 324 through which fluid can flow when the valve 300 is in an open position (i.e., when the closure member 316 is spaced away from the valve seat 318).
- a cage can be configured in different manners to provide certain fluid flow characteristics to suit the needs of a particular control application.
- the openings 324 may be designed or configured to provide particular, desirable fluid flow characteristics of the fluid such as, for example, to reduce noise and/or cavitation, to enhance pressure reductions of the process fluid, etc.
- the desired fluid flow characteristics are achieved by varying the geometry of the openings 324.
- the cage 314 may include a plurality of openings having various shapes, sizes, and/or spacing(s) to control the flow, reduce cavitation, and/or reduce noise through the valve.
- the cage 314 guides the closure member 316 and provides lateral stability as the closure member 316 travels between the open position and a closed position, thereby reducing vibrations and other mechanical stress.
- the cage 314 can also facilitate maintenance, removal, and/or replacement of the other components of the valve trim assembly 312.
- the cage 314 is a substantially unitary structure.
- the cage 314 can be a two-piece structure that includes an upper portion that removably couples to a lower portion.
- a retainer (not shown) may be used to retain the cage 314 within the valve body 304.
- the closure member 316 has an outer surface 326 sized to closely fit within the cage 314 so that the closure member 316 can slide within the bore 322 of the cage 314.
- the closure member 316 can slide within the cage 314 between the closed position, in which the closure member 316 obstructs the openings 324 of the cage 314, and the open position, in which the closure member 316 is clear of (i.e., does not block) at least a portion of the openings 324.
- the closure member 316 is depicted as a valve plug having a cylindrical body and a seating surface 328.
- the closure member 316 may be a disk or any other structure to vary the flow of fluid through a valve.
- the closure member 316 includes channels or conduits 330 to balance the pressures acting across the closure member 316.
- the forces exerted across the closure member 316 by the pressure of the process fluid flowing through the valve 300 are substantially equalized.
- the pressure of the fluid in the cavity 332 exerts a force on a first side or surface 334 of the closure member 316 that is approximately equal to and opposite a force exerted on a second side or surface 336 of the closure member 316.
- a smaller actuating force can be provided to move the closure member 316 between the open and closed positions.
- the valve stem 320 is operatively coupled to the closure member 316 at a first end 338 and extends through a bonnet 340 to couple the closure member 316 to an actuator stem (not shown) at a second end 342.
- the actuator stem couples the closure member 316 to an actuator (not shown).
- the actuator e.g., a pneumatic actuator
- the bonnet 340 is coupled to the valve body 304 via fasteners 346, and the bonnet 340 couples the valve body 304 to the actuator (not shown).
- the bonnet 340 houses a packing system 347 (e.g., a spring packing), which prevents undesired leakage to the environment via the valve stem 320 as the valve stem 320 moves or slides within the valve 300 along an axis 348.
- the bonnet 340 also includes a gasket 350 to prevent unwanted fluid leakage through the valve body 304.
- the bonnet 340 is fixed to the valve body 304 to retain (e.g., via an interference and/or press fit) the cage 314 and the valve seat 318 within the valve body 304.
- the valve seat 318 couples to the cage 314 and/or the valve body 304 via, for example, fasteners, etc.
- a gap 402 is formed between the closure member 316 and the cage 314. Fluid may leak through the gap 402.
- fluid from the inlet 308 may flow via the gap 402 through the conduits 330 of the closure member 316, and through the outlet 310 of the valve 300.
- Such unwanted leakage affects the shut-off classification of the valve 300.
- the American National Standards Institute has established various leakage classifications (e.g., Class I, II, III, etc.) relating to the amount of fluid flow allowed to pass through a valve when the valve is in a closed position.
- the seal assembly 302 is disposed between the cage 314 and the closure member 316 to prevent leakage between the inlet 308 and the outlet 310 of the valve 300 when the closure member 316 is in the closed position to improve the shut-off classification of the valve 300.
- the example seal assembly 302 prevents unwanted leakage through the gap 402 when the closure member 316 is in the closed position.
- the seal assembly 302 effects a seal between a first sealing surface 404a (e.g., an inner surface of the cage 314) and a second sealing surface 404b (e.g., the outer surface 326 of the closure member 316).
- the closure member 316 includes a shoulder 406 to receive the seal assembly 302.
- a retaining or snap ring 408 retains the seal assembly 302 between the retaining ring 408 and the shoulder 406 of the closure member 316.
- a back-up ring 410 may be disposed between the retaining ring 408 and the seal assembly 302 to maintain the position and/or orientation of the seal assembly 302 relative to the closure member 316.
- the seal assembly 302 may include an anti-extrusion ring (e.g., disposed adjacent the shoulder 406 and/or the back-up ring 410) to prevent the seal assembly 302 from extruding into the gap 402 as the closure member 316 moves between the open position and the closed position.
- an anti-extrusion ring e.g., disposed adjacent the shoulder 406 and/or the back-up ring 410 to prevent the seal assembly 302 from extruding into the gap 402 as the closure member 316 moves between the open position and the closed position.
- the seal assembly 302 includes a first seal 412, a second seal 414, and a spacer ring 416.
- the first seal 412 is substantially similar or identical to the second seal 414.
- Each of the first and second seals 412 and 414 is implemented as a spring-loaded seal.
- the seals 412 and 414 include respective springs 418a and 418b disposed within respective outer jackets 420a and 420b.
- the springs 418a and 418b include a ring-shaped cantilevered finger spring and have a V-shaped (or U-shaped) cross-sectional shape.
- the springs 418a and 418b may be made of, for example, stainless steel, or any other suitable material.
- the jackets 420a and 420b are also in the form of a ring and can be unitary or partially ring-shaped.
- the jackets 420a and 420b include respective cavities or channels 422a and 422b to receive the springs 418a and 418b.
- the jackets 420a and 420b may be made of a flexible material that does not generate excessive friction between the closure member 316 and the cage 314.
- the jackets 420a and 420b may be made of a fluoropolymer material (e.g., TeflonĀ®), an elastomeric material, or any other suitable material.
- the springs 418a and 418b provide a load to assist or bias outer surfaces 424a and 424b of the outer jackets 420a and 420b against the first sealing surface 404a and the second sealing surface 404b.
- the first seal 412 may be different from the second seal 414.
- the jacket 420a of the first seal 412 may be made of a material that is different from the material of the jacket 420b of the second seal 414.
- the first seal 412 is disposed between the closure member 316 and the cage 314 in an opposite direction or orientation relative to the second seal 414.
- the channel 422a of the first seal 412 faces the channel 422b of the second seal 414.
- the first and second seals 412 and 414 provide a bidirectional seal to prevent leakage between the closure member 316 and the cage 314 regardless of the direction of fluid flow through the valve 300.
- the spacer ring 416 is at least partially disposed within the channels 422a and 422b of the respective first and second seals 412 and 414.
- the spacer ring 416 prevents the first and second seals 412 and 414 from contacting each other when the pressure of the fluid in the flow passageway 306 is insufficient to pressure-assist or hold the first and second seals 412 and 414 in spaced apart relation relative to each other.
- the spacer ring 416 is sized to fit within the outer surfaces 424a and 424b of the jackets 420a and 420b.
- the spacer ring 416 is sized so that it does not engage or contact the first sealing surface 404a (i.e., the inner surface or bore 322 of the cage 314) and/or the second sealing surface 404b.
- the spacer ring 416 may be made of, for example, a thermoplastic material such as, for example, polyetheretherketone (PEEK), a metal, or any other suitable materials and/or materials that can withstand fluids having relatively high temperatures (e.g., fluid temperatures above 232Ā°C (450Ā°F), greater than 232Ā°C (450Ā°F) with the use of an anti-extrusion ring, etc.).
- the seal assembly 302 e.g., the outer surfaces 424a and/or 424b
- the spacer ring 416 will not engage or slide against the cage 314 (i.e., the first sealing surface 404a), thereby substantially reducing seal friction between the closure member 316 and the cage 314.
- the seal assembly 302 substantially increases the life of the spacer ring 416 because the spacer ring 416 does not engage the cage 314 or the closure member 316.
- an actuator e.g., a pneumatic actuator drives the closure member 316 between the fully open or maximum flow rate position at which the seating surface 328 of the closure member 316 is spaced away from the valve seat 318 to allow the flow of fluid through the valve 300 and a closed position.
- the seal assembly 302 moves or slides in a direction along the axis 348 as the closure member 316 moves between the open position and the closed position.
- the closure member 316 sealingly engages the valve seat 318 and blocks the openings 324 of the cage 314 to prevent fluid flow through the valve 300 between the inlet 308 and the outlet 310.
- valve 300 When the valve 300 is in the closed position, fluid may flow into the gap 402 between the closure member 316 and the cage 314.
- the seal assembly 302 described herein prevents the fluid from traveling further and, thus, prevents the fluid from leaking between the cage 314 and closure member 316.
- fluid attempting to leak through the valve 300 between the closure member 316 and the cage 314 from the inlet 308 presses against an inner surface 422b of the jacket 420b, thereby pressure-assisting the outer surface 424b against the sealing surfaces 404a and 404b.
- fluid attempting to leak through the valve 300 between the closure member 316 and the cage 314 that is flowing through the conduits 330 of the closure member 316 presses against an inner surface 422a of the jacket 420a, thereby pressure-assisting the outer surface 424a of the jacket 420a against the sealing surfaces 404a and 404b.
- This action improves the seal (e.g., provides a tighter seal) between the closure member 316 and the cage 314.
- the spring-loaded seals 412 and 414 enable a relatively relaxed tolerance in machining and assembly of the valve components and/or dimensional variations caused by temperature changes.
- the spacer ring 416 maintains or keeps the first and second seals 412 and 414 in spaced apart relation and prevents the first and second seals 412 and 414 from contacting each other. Failing to maintain the first and second seals 412 and 414 in spaced apart relation may otherwise cause the first and second seals 412 and 414 to become jammed or stuck within the gap 402 between the cage 314 and the closure member 316, thereby resulting in an ineffective seal.
- FIG. 5 illustrates an enlarged portion of a valve 500 that is implemented with another example seal assembly 502 according to the invention.
- Those components of the example valve 500 of FIG. 5 that are substantially similar or identical to those components of the example valve 300 described above and that have functions substantially similar or identical to the functions of those components will not be described in detail again below. Instead, the interested reader is referred to the above corresponding descriptions in connection with FIGS. 3 and 4 .
- Those components that are substantially similar or identical will be referenced with the same reference numbers as those components described in connection with FIGS. 3 and 4 .
- the example valve 500 is substantially similar to the example valve 300 of FIGS. 3 and 4 .
- a closure member 504 of the example valve 500 is implemented with a vent or passageway 506 to fluidly couple the fluid flow passageway 306 (see FIG. 3 ) to the seal assembly 502 via the conduits 330.
- the seal assembly 502 includes a first seal 508 and a second seal 510 opposite the first seal 508.
- a spacer ring 512 is disposed between the first and second seals 508 and 510 to prevent the first and second seals 508 and 510 from contacting each other.
- the first and second seals 508 and 510 are substantially similar or identical to the seals 412 and 414 of FIGS. 3 and 4 and, thus, for brevity, the description of the first and second seals 508 and 510 will not be repeated.
- the passageway 506 enables pressurized fluid to flow to the seal assembly 502 between the channels 422a and 422b.
- the spacer ring 512 includes an aperture or opening 514 to enable the pressurized fluid to flow to a first side 516a of the spacer ring 512 opposite a second side 516b facing the passageway 506.
- the passageway 506 and the opening 514 of the spacer ring 512 provides equalization of pressure across the seal assembly 502, thereby further reducing friction between the cage 314 and the first and second seals 508 and 510 when the closure member 504 moves between an open position and closed position.
- the operating lives of the jackets 420a and 420b of the respective first and second seals 508 and 510 and the spacer ring 512 are substantially increased.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding Valves (AREA)
- Valve Housings (AREA)
- Gasket Seals (AREA)
- Sealing Devices (AREA)
- Check Valves (AREA)
- Details Of Valves (AREA)
Description
- This disclosure relates generally to valves and, more particularly, to a bidirectional seal assembly for use with valves.
- Valves are commonly used in process control systems to control the flow of process fluids. Sliding stem valves (e.g., a gate valve, a globe valve, a diaphragm valve, a pinch valve, etc.) typically have a closure member (e.g., a valve plug) disposed in a fluid path. A valve stem operatively couples the closure member to an actuator that moves the closure member between an open position and a closed position to allow or restrict the flow of fluid between an inlet and an outlet of the valve. Additionally, to provide a desired and/or to achieve certain flow characteristics of the fluid, valves often employ a cage that interposes in the path of fluid between the inlet and the outlet of the valve. A cage can reduce capacity flow, attenuate noise, and/or reduce or eliminate cavitation. Additionally, a cage surrounds the closure member to provide stability, balance, and alignment to the closure member.
- To effect a seal between a cage and a closure member, the closure member typically includes a channel or groove that receives a seal and/or piston ring that engages an inner surface of the cage. Typically, the size of the valve, industrial process conditions such as pressure conditions and operational temperatures (e.g., temperatures between - 73Ā°C and 232Ā°C (-100Ā°F and 450Ā°F), temperatures greater than 232Ā°C (450Ā°F) with the use of an anti-extrusion ring, etc.) of the process fluids are used to determine the type of valve and valve components that may be used such as, for example, the types of seals that may be used to effect a seal between a cage and a closure member. For example, a valve having a process fluid that experiences a relatively high pressure differential across its flow passageway typically employs a pressure-balanced closure member to minimize or reduce the thrust or force to be exerted by an actuator to move the closure member to a closed position. Additionally, valves having larger sized ports or flow passageways (e.g., greater than 2.54 cm (1 inch) in diameter) may employ spring-loaded seals to provide a tighter seal. Typically, a bidirectional seal assembly is often employed with pressure-balanced closure members to provide bidirectional sealing between the cage and closure member to minimize or eliminate leakage in forward and reverse fluid flow applications.
- Some known bidirectional sealing assemblies include spacer rings to maintain opposing seals separated or spaced apart from each other. The spacer rings are often sized to provide a clearance between the spacer ring (e.g., an outside diameter of the spacer ring) and a surface of the cage (e.g., an inner surface of the cage). However, due to wear, manufacturing tolerances, etc., the spacer ring may engage or contact the surface of the cage as the valve plug moves between an open position and a closed position, thereby increasing friction between the closure member or the seal assembly and the cage. While spacer rings made of metal material can be used to prevent excessive or rapid wear of the spacer rings, such metal spacer rings may mare or damage the cage surface, thereby causing unwanted leakage and reducing the life of the cage.
- Patent Documents
DE 802 488 C ,US 4 706 970 A ,US 2 187 257 A ,WO 99/022164 A1 US 2002/017327 , andUS 2003/222410 A1 , relate to various valve apparatus, and seals for use with a sealing apparatus. -
Patent Document EP 2 159 459 A1 forms prior art under Article 54(3) EPC. It relates to a sealing assembly for a shaft including a sealing component, at least one energizer associated with said seal component wherein said sealing assembly is configured for being disposed in one of a single gland, groove and space of a housing and being thereby configured for sealing in two axial directions in one of said single gland, groove, and space and is thereby configured for providing bi-directional sealing in a high-pressure seal operational area. - According to the invention, the problem is solved by means of a valve as defined in independent claim 1. Advantageous further developments of the valve according to the invention are set forth in the dependent claims.
- An example seal assembly for use with valves described herein includes a first seal and a second seal opposite the first seal. The first and second seals are to sealingly engage a closure member of a valve and a sealing surface opposite the closure member. A spacer ring is disposed between the first and second seals to prevent the first and second seals from contacting each other. Additionally, the spacer ring is sized so that the spacer ring does not contact the closure member or the sealing surface.
- In another example, a valve includes a valve body having a valve plug disposed between an outlet and an inlet of the valve body. The valve plug moves between an open position to allow fluid flow through the valve and a closed position to prevent fluid flow through the valve. The valve also includes a cage having a first opening to slidably receive at least a portion of the valve plug and a second opening to control the flow characteristics of fluid through the control valve. A seal assembly is disposed adjacent an inner surface of the first opening of the cage and an outer surface of the valve plug to substantially prevent leakage of fluid between the cage and the valve plug when the valve plug is in the closed position. The seal assembly includes a first spring-loaded seal and a second spring-loaded seal opposite the first spring-loaded seal. The seal assembly also includes a spacer ring disposed between the first and second spring-loaded seals to maintain the first and second spring-loaded seals in spaced apart relation to prevent the first and second spring-loaded seals from contacting each other. Additionally, the spacer ring is sized to not contact the cage or the valve plug.
- In yet another example, a seal for use with a valve includes first means for sealing and second means for sealing opposite the first means for sealing. The first and second means for sealing are to sealingly engage a closure member of a valve and a sealing surface opposite the closure member. The valve further includes means for retaining the first means for sealing away from the second means for sealing to prevent the first and second means for sealing from contacting each other. The means for retaining is sized so that the means for retaining does not contact the closure member or the sealing surface.
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FIG. 1 is a cross-sectional view of a portion of a known valve implemented with a known sealing assembly. -
FIG. 2 is an enlarged portion of the example valve ofFIG. 1 . -
FIG. 3 is a cross-sectional view of a portion of a valve implemented with an example seal assembly described herein. -
FIG. 4 is an enlarged portion of the example valve ofFIG. 3 . -
FIG. 5 illustrates an enlarged portion of a valve implemented with another example seal assembly according to the invention. - The example seal assemblies described herein may be used with valves having a sliding stem such as, for example, control valves, throttling valves, etc., which may include a valve trim arrangement (e.g., a cage). In general, the example seal assemblies described herein effect a seal to substantially prevent leakage between a sealing surface or a cage and a closure member (e.g., a valve plug) of a valve. In particular, an example seal assembly described herein includes a first seal and a second seal opposite the first seal where both seals are disposed between an outer surface of the closure member and an inner surface of the cage. A spacer ring is disposed between the first and second seals to prevent the first and second seals from contacting each other when the pressure of the process fluid is insufficient to assist the seals to seal against a sealing surface (e.g., the inner surface of the cage and the outer surface of the closure member). More specifically, the spacer ring is at least partially disposed within cavities of the first and second seals and is sized (e.g., has a width or is dimensioned) to fit within outer surfaces of the first and second seals so that the spacer ring does not engage or contact the outer surface of the closure member and/or the inner surface of the cage. The spacer ring may be made of a thermoplastic material, a polymer, a metal, or any other material(s).
-
FIG. 1 illustrates a cross-sectional view of a portion of a knownvalve 100. Thevalve 100 illustrated inFIG. 1 includes avalve body 102 that defines afluid flow passageway 104 between aninlet 106 and an outlet 108. Avalve plug 110 is slidably disposed within acage 112 and moves between an open position and a closed position to control the fluid flow rate through thevalve 100. Avalve stem 114 couples thevalve plug 110 to an actuator (not shown), which moves thevalve plug 110 toward and away from avalve seat 116. In operation, the actuator moves thevalve plug 110 away from thevalve seat 116 to allow fluid flow through the valve 100 (e.g., the open position) and toward thevalve seat 116 to restrict fluid flow through thevalve 100. Thevalve plug 110 sealingly engages thevalve seat 116 to prevent fluid flow through the valve 100 (e.g., the closed position). Aseal assembly 118 prevents fluid leakage between thevalve plug 110 and thecage 112 when thevalve 100 is in the closed position (i.e., when thevalve plug 110 sealingly engages the valve seat 116) as shown inFIG. 1 . -
FIG. 2 depicts an enlarged portion of thevalve plug 110, thecage 112, and theseal assembly 118 ofFIG. 1 . Thevalve plug 110 includes a recessedportion 202 to receive theseal assembly 118. Theseal assembly 118 engages aninner surface 204 of thecage 112 to prevent fluid from leaking between thecage 112 and thevalve plug 110 when thevalve 100 is in the closed position. Theseal assembly 118 includes a first spring-loadedseal 206 disposed between ashoulder 208 of thevalve plug 110 and afirst spacer ring 210, and a second spring-loadedseal 212 disposed between thefirst spacer ring 210 and asecond spacer ring 214. Theseal assembly 118 also includes aretaining ring 216 to retain or hold theseal assembly 118 together. - The first and second spring-loaded
seals springs coverings springs seal 206 from contacting the second spring-loadedseal 212 as thevalve plug 110 moves relative to thecage 112. Additionally, the spacer rings 210 and 214 retain the spring-loadedseals seals cage 112 and thevalve plug 110, thereby preventing impairment of the operation of theseals cage 112, or thevalve plug 110. The spacer rings 210 and 214 are made of a metallic material to prevent excessive wear to therings seals 206 and/or 212 wear such that the spacer rings 210 and/or 214 engage or contact the surface of the cage as the valve plug moves between an open position and a closed position. While spacer rings made of metallic materials can be used to prevent excessive or rapid wear of the spacer rings, such metal spacer rings may mare or damage the cage surface, thereby causing unwanted leakage and reducing the life of the cage. -
FIG. 3 illustrates a cross-sectional view of avalve 300 implemented with an examplebidirectional seal assembly 302 described herein. Thevalve 300 illustrated inFIG. 3 includes avalve body 304 that defines afluid flow passageway 306 between a first port orinlet 308 and a second port or outlet 310. In other examples, because theexample seal assembly 302 provides a bidirectional seal, the direction of fluid flowing through the valve may be reversed such that the second port 310 is an inlet port and thefirst port 308 is an outlet port. - A valve
trim assembly 312 interposes in thefluid flow passageway 306 to control fluid flow between theinlet 308 and the outlet 310. The valvetrim assembly 312 includes internal components of thevalve 300 such as, for example, acage 314, a closure member 316 (e.g., a valve plug), a valve seat 318 (e.g., a seat ring), and avalve stem 320. - The
cage 314 is disposed between theinlet 308 and the outlet 310 to provide certain fluid flow characteristics through the valve body 304 (e.g., reduce noise and/or cavitation generated by the flow of fluid through the valve 300). Thecage 314 includes abore 322 to receive (e.g., slidably receive) theclosure member 316 and at least oneopening 324 through which fluid can flow when thevalve 300 is in an open position (i.e., when theclosure member 316 is spaced away from the valve seat 318). A cage can be configured in different manners to provide certain fluid flow characteristics to suit the needs of a particular control application. For example, theopenings 324 may be designed or configured to provide particular, desirable fluid flow characteristics of the fluid such as, for example, to reduce noise and/or cavitation, to enhance pressure reductions of the process fluid, etc. The desired fluid flow characteristics are achieved by varying the geometry of theopenings 324. In some example implementations, thecage 314 may include a plurality of openings having various shapes, sizes, and/or spacing(s) to control the flow, reduce cavitation, and/or reduce noise through the valve. - The
cage 314 guides theclosure member 316 and provides lateral stability as theclosure member 316 travels between the open position and a closed position, thereby reducing vibrations and other mechanical stress. Thecage 314 can also facilitate maintenance, removal, and/or replacement of the other components of the valvetrim assembly 312. In the illustrated example, thecage 314 is a substantially unitary structure. However, in other example implementations, thecage 314 can be a two-piece structure that includes an upper portion that removably couples to a lower portion. In yet other examples, a retainer (not shown) may be used to retain thecage 314 within thevalve body 304. - The
closure member 316 has an outer surface 326 sized to closely fit within thecage 314 so that theclosure member 316 can slide within thebore 322 of thecage 314. Theclosure member 316 can slide within thecage 314 between the closed position, in which theclosure member 316 obstructs theopenings 324 of thecage 314, and the open position, in which theclosure member 316 is clear of (i.e., does not block) at least a portion of theopenings 324. In the illustrated example, theclosure member 316 is depicted as a valve plug having a cylindrical body and aseating surface 328. However, in other examples, theclosure member 316 may be a disk or any other structure to vary the flow of fluid through a valve. - In this example, the
closure member 316 includes channels orconduits 330 to balance the pressures acting across theclosure member 316. In this manner, the forces exerted across theclosure member 316 by the pressure of the process fluid flowing through thevalve 300 are substantially equalized. For example, the pressure of the fluid in thecavity 332 exerts a force on a first side orsurface 334 of theclosure member 316 that is approximately equal to and opposite a force exerted on a second side orsurface 336 of theclosure member 316. As a result, a smaller actuating force can be provided to move theclosure member 316 between the open and closed positions. - The
valve stem 320 is operatively coupled to theclosure member 316 at afirst end 338 and extends through abonnet 340 to couple theclosure member 316 to an actuator stem (not shown) at asecond end 342. The actuator stem couples theclosure member 316 to an actuator (not shown). The actuator (e.g., a pneumatic actuator) drives thevalve stem 320 and, thus, theclosure member 316 between the closed position at which theclosure member 316 is in sealing engagement with the valve seat 318 (e.g., a seat ring) to restrict or prevent fluid flow through thevalve 300 and the fully open or maximum flow rate position at which theclosure member 316 is spaced away from thevalve seat 318 to allow fluid flow through thevalve 300. In the open position, fluid flows between theinlet 308, through theopenings 324 of the cage and anopening 344 of thevalve seat 318 and through the outlet 310. In the closed position, theclosure member 316 covers theopenings 324 of thecage 314 and sealingly engages thevalve seat 318 via the sealingsurface 328 to prevent fluid flow between theinlet 308 and the outlet 310. - The
bonnet 340 is coupled to thevalve body 304 viafasteners 346, and thebonnet 340 couples thevalve body 304 to the actuator (not shown). Thebonnet 340 houses a packing system 347 (e.g., a spring packing), which prevents undesired leakage to the environment via thevalve stem 320 as thevalve stem 320 moves or slides within thevalve 300 along an axis 348. Thebonnet 340 also includes agasket 350 to prevent unwanted fluid leakage through thevalve body 304. In this example, thebonnet 340 is fixed to thevalve body 304 to retain (e.g., via an interference and/or press fit) thecage 314 and thevalve seat 318 within thevalve body 304. In other examples, thevalve seat 318 couples to thecage 314 and/or thevalve body 304 via, for example, fasteners, etc. - Referring also to
FIG. 4 , although theclosure member 316 closely fits within thebore 322 of thecage 314, agap 402 is formed between theclosure member 316 and thecage 314. Fluid may leak through thegap 402. For example, when thevalve 300 is in the closed position, fluid from theinlet 308 may flow via thegap 402 through theconduits 330 of theclosure member 316, and through the outlet 310 of thevalve 300. Such unwanted leakage affects the shut-off classification of thevalve 300. For example, the American National Standards Institute has established various leakage classifications (e.g., Class I, II, III, etc.) relating to the amount of fluid flow allowed to pass through a valve when the valve is in a closed position. Theseal assembly 302 is disposed between thecage 314 and theclosure member 316 to prevent leakage between theinlet 308 and the outlet 310 of thevalve 300 when theclosure member 316 is in the closed position to improve the shut-off classification of thevalve 300. - The
example seal assembly 302 prevents unwanted leakage through thegap 402 when theclosure member 316 is in the closed position. Thus, theseal assembly 302 effects a seal between afirst sealing surface 404a (e.g., an inner surface of the cage 314) and asecond sealing surface 404b (e.g., the outer surface 326 of the closure member 316). Theclosure member 316 includes ashoulder 406 to receive theseal assembly 302. A retaining orsnap ring 408 retains theseal assembly 302 between the retainingring 408 and theshoulder 406 of theclosure member 316. A back-upring 410 may be disposed between the retainingring 408 and theseal assembly 302 to maintain the position and/or orientation of theseal assembly 302 relative to theclosure member 316. Additionally or alternatively, although not shown, theseal assembly 302 may include an anti-extrusion ring (e.g., disposed adjacent theshoulder 406 and/or the back-up ring 410) to prevent theseal assembly 302 from extruding into thegap 402 as theclosure member 316 moves between the open position and the closed position. - The
seal assembly 302 includes afirst seal 412, asecond seal 414, and aspacer ring 416. In this example, thefirst seal 412 is substantially similar or identical to thesecond seal 414. Each of the first andsecond seals seals respective springs outer jackets springs springs jackets jackets channels springs jackets closure member 316 and thecage 314. For example, thejackets respective channels springs outer surfaces outer jackets first sealing surface 404a and thesecond sealing surface 404b. In other examples, thefirst seal 412 may be different from thesecond seal 414. For example, thejacket 420a of thefirst seal 412 may be made of a material that is different from the material of thejacket 420b of thesecond seal 414. - The
first seal 412 is disposed between theclosure member 316 and thecage 314 in an opposite direction or orientation relative to thesecond seal 414. In particular, as depicted in this example, thechannel 422a of thefirst seal 412 faces thechannel 422b of thesecond seal 414. In this manner, the first andsecond seals closure member 316 and thecage 314 regardless of the direction of fluid flow through thevalve 300. - The
spacer ring 416 is at least partially disposed within thechannels second seals spacer ring 416 prevents the first andsecond seals flow passageway 306 is insufficient to pressure-assist or hold the first andsecond seals spacer ring 416 is sized to fit within theouter surfaces jackets spacer ring 416 is sized so that it does not engage or contact thefirst sealing surface 404a (i.e., the inner surface or bore 322 of the cage 314) and/or thesecond sealing surface 404b. As a result, thespacer ring 416 may be made of, for example, a thermoplastic material such as, for example, polyetheretherketone (PEEK), a metal, or any other suitable materials and/or materials that can withstand fluids having relatively high temperatures (e.g., fluid temperatures above 232Ā°C (450Ā°F), greater than 232Ā°C (450Ā°F) with the use of an anti-extrusion ring, etc.). - Also, for example, should the seal assembly 302 (e.g., the
outer surfaces 424a and/or 424b) wear, thespacer ring 416 will not engage or slide against the cage 314 (i.e., thefirst sealing surface 404a), thereby substantially reducing seal friction between theclosure member 316 and thecage 314. In general, theseal assembly 302 substantially increases the life of thespacer ring 416 because thespacer ring 416 does not engage thecage 314 or theclosure member 316. - Referring to
FIGS. 3 and4 , in operation, an actuator (e.g., a pneumatic actuator) drives theclosure member 316 between the fully open or maximum flow rate position at which theseating surface 328 of theclosure member 316 is spaced away from thevalve seat 318 to allow the flow of fluid through thevalve 300 and a closed position. Theseal assembly 302 moves or slides in a direction along the axis 348 as theclosure member 316 moves between the open position and the closed position. At the closed position, theclosure member 316 sealingly engages thevalve seat 318 and blocks theopenings 324 of thecage 314 to prevent fluid flow through thevalve 300 between theinlet 308 and the outlet 310. - When the
valve 300 is in the closed position, fluid may flow into thegap 402 between theclosure member 316 and thecage 314. Theseal assembly 302 described herein prevents the fluid from traveling further and, thus, prevents the fluid from leaking between thecage 314 andclosure member 316. - The
outer jackets second seals surfaces springs jackets outer surfaces jackets surfaces cage 314 and theclosure member 316. For example, fluid attempting to leak through thevalve 300 between theclosure member 316 and thecage 314 from theinlet 308 presses against aninner surface 422b of thejacket 420b, thereby pressure-assisting theouter surface 424b against the sealingsurfaces valve 300 between theclosure member 316 and thecage 314 that is flowing through theconduits 330 of theclosure member 316 presses against aninner surface 422a of thejacket 420a, thereby pressure-assisting theouter surface 424a of thejacket 420a against the sealingsurfaces closure member 316 and thecage 314. - Additionally or alternatively, because the
springs respective jackets surfaces seals - In operation, the
spacer ring 416 maintains or keeps the first andsecond seals second seals second seals second seals gap 402 between thecage 314 and theclosure member 316, thereby resulting in an ineffective seal. -
FIG. 5 illustrates an enlarged portion of avalve 500 that is implemented with anotherexample seal assembly 502 according to the invention. Those components of theexample valve 500 ofFIG. 5 that are substantially similar or identical to those components of theexample valve 300 described above and that have functions substantially similar or identical to the functions of those components will not be described in detail again below. Instead, the interested reader is referred to the above corresponding descriptions in connection withFIGS. 3 and4 . Those components that are substantially similar or identical will be referenced with the same reference numbers as those components described in connection withFIGS. 3 and4 . - The
example valve 500 is substantially similar to theexample valve 300 ofFIGS. 3 and4 . However, aclosure member 504 of theexample valve 500 is implemented with a vent orpassageway 506 to fluidly couple the fluid flow passageway 306 (seeFIG. 3 ) to theseal assembly 502 via theconduits 330. Theseal assembly 502 includes afirst seal 508 and asecond seal 510 opposite thefirst seal 508. Aspacer ring 512 is disposed between the first andsecond seals second seals second seals seals FIGS. 3 and4 and, thus, for brevity, the description of the first andsecond seals - The
passageway 506 enables pressurized fluid to flow to theseal assembly 502 between thechannels spacer ring 512 includes an aperture oropening 514 to enable the pressurized fluid to flow to afirst side 516a of thespacer ring 512 opposite asecond side 516b facing thepassageway 506. In this manner, thepassageway 506 and theopening 514 of thespacer ring 512 provides equalization of pressure across theseal assembly 502, thereby further reducing friction between thecage 314 and the first andsecond seals closure member 504 moves between an open position and closed position. As a result of the reduced friction between thecage 314 and theclosure member 316, the operating lives of thejackets second seals spacer ring 512 are substantially increased. - Although certain apparatus have been described herein, the scope of coverage of this patent is not limited thereto. To the contrary, this patent covers all apparatus fairly falling within the scope of the appended claims.
Claims (10)
- A valve (300), comprising:a valve body (304) having a valve plug (316) disposed between an outlet (310) and an inlet (308) of the valve body (304), wherein the valve plug (316) moves between an open position to allow fluid flow through the valve (300) and a closed position to prevent fluid flow through the valve (300);a cage (314) having a first opening (322) to slidably receive at least a portion of the valve plug and a second opening (324) to control the flow characteristics of fluid through the valve (300); anda seal assembly (502) disposed adjacent an inner surface (404a) of the first opening (322) of the cage (314) and an outer surface (404b) of the valve plug (316) to substantially prevent leakage of fluid between the cage (314) and the valve plug (316) when the valve plug (316) is in the closed position;characterized in that the seal assembly (502) comprises:a first seal (508) and a second seal (510) opposite the first seal, wherein the first and second seals (508, 510) are configured to sealingly engage the valve plug (316) and the inner surface (404a) of the cage (314) opposite the valve plug (316) and each of the first seal (508) and the second seal (510) includes a spring (418a, 418b) disposed within a respective jacket (420a, 420b), the respective spring (418a, 418b) being configured to urge the respective jacket (420a, 420b) against the inner surface (404a) and the valve plug (316); anda spacer ring (512) disposed between the first and second seals (508, 510) to prevent the first and second seals (508, 510) from contacting each other; wherein the spacer ring (512) is sized to fit within outer surfaces (424a, 424b) of the jackets (420a, 420b) of the first and second seals (508, 510) so that the spacer ring (512) does not contact the valve plug (316) or the inner surface (404a);the spacer ring (512) has a radially facing first side (516a) and a radially facing second side (516b) opposite the first side (516a);a first gap separates a first portion of the respective spring from the first side of the spacer ring and a second gap separates a second portion of the respective spring from the second side of the spacer ring; andthe spacer ring (512) includes an aperture (514) therethrough to enable the flow of pressurized fluid between the first side and the second side of the spacer ring (512).
- A valve (300) as defined in claim 1, wherein each of the first and second seals (508, 510) includes a cavity (422a, 422b).
- A valve (300) as defined in claim 2, wherein the cavities (422a, 422b) of the first and second seals (508, 510) face each other.
- A valve (300) as defined in claim 2, wherein the spacer ring (512) is at least partially disposed within the cavities (422a, 422b) of the first and second seals (508, 510) to prevent the first and second seals (508, 510) from contacting each other.
- A valve (300) as defined in claim 1, wherein the spacer ring (512) comprises a metal or thermoplastic material.
- A valve (300) as defined in claim 1, wherein the seal assembly (502) further comprises a back-up ring (410) adjacent the first seal or the second seal (508, 510).
- A valve (300) as defined in claim 6, wherein the seal assembly (502) further comprises a retaining ring (408) adjacent the back-up ring (410).
- A valve (300) as defined in claim 1, wherein the spring comprises stainless steel.
- A valve (300) as defined in claim 1, wherein the springs (418a, 418b) have a V-shaped or U-shaped cross-sectional shape.
- A valve (300) as defined in claim 1, wherein the jackets (420a, 420b) comprise a thermoplastic material.
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US12/430,978 US8714560B2 (en) | 2009-04-28 | 2009-04-28 | Bidirectional seal assembly for use with valves |
PCT/US2010/029090 WO2010126671A1 (en) | 2009-04-28 | 2010-03-29 | Bidirectional seal assembly for use with valves |
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EP2425158A1 EP2425158A1 (en) | 2012-03-07 |
EP2425158B1 true EP2425158B1 (en) | 2019-07-17 |
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Application Number | Title | Priority Date | Filing Date |
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EP10722842.1A Active EP2425158B1 (en) | 2009-04-28 | 2010-03-29 | Valve with bidirectional seal assembly |
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US (3) | US8714560B2 (en) |
EP (1) | EP2425158B1 (en) |
CN (1) | CN102422065B (en) |
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- 2010-03-29 MX MX2011011537A patent/MX2011011537A/en active IP Right Grant
- 2010-03-29 BR BRPI1013995A patent/BRPI1013995A2/en not_active Application Discontinuation
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- 2010-03-29 EP EP10722842.1A patent/EP2425158B1/en active Active
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SA516371851B1 (en) | 2021-03-06 |
CN102422065B (en) | 2016-02-03 |
EP2425158A1 (en) | 2012-03-07 |
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US8714560B2 (en) | 2014-05-06 |
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AR076366A1 (en) | 2011-06-08 |
AU2010241948B2 (en) | 2016-08-11 |
AU2010241948A1 (en) | 2011-11-24 |
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CN102422065A (en) | 2012-04-18 |
BRPI1013995A2 (en) | 2016-04-05 |
US20140197603A1 (en) | 2014-07-17 |
RU2527002C2 (en) | 2014-08-27 |
NO20111501A1 (en) | 2011-11-03 |
MY156823A (en) | 2016-03-31 |
CA2760228A1 (en) | 2010-11-04 |
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